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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b694950525939a85d00ddfdd30236afbc598ccb9a03f863bdd1bee6499bd46' 
  AND token = 'LB7exncd4jkEHgOt0ySopuW8D4RRFC9Q1wfEgFAlLp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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