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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb621db1a906bf3cb4de63924d3a4bffda4e6d419039dc780881c2592f5ac440' 
  AND token = 'rCwOejseHBc87cEdsJIWDuGWIKrgn2w94pzJNx2w8iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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