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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e7067749df02bdd5feb3cce9eb2608fab027f29ce4b613c065c0617edbc403' 
  AND token = 'l6QgucuWtfyP9Pp9HMsB5CDCK2Dy6LtNsj+4Krgyzx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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