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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8ba8782f3ef89f3c33367d789c3eb6cd8dc5b06b653d691b8294e5c184c95b' 
  AND token = 'xHVHawg44HsWeJJ+0Y0+54FNPAu9E/5CGCHYP50LWvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}