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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97061757e50125c118f76c529e746c6b279c0e5e44188de0fc0c68e0cbd0791' 
  AND token = 'qgHsGdP7ztMEPi2nx3UD3M808O/TkhMEEiVsc/kMhBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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