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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9625f246e9eeedf6c4eb80795a0d6c8f08d97122fb9f162f5d932f70b13a8e' 
  AND token = 'DC/145ph2HN1Q9gjs6rlXUAB+0mK7E2Eq786emZ20RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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