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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee5d4fd80561aab69192720e6da23857ebfa53abfc05afea24350713d321fe8' 
  AND token = 'Z3bMB6OStKbHPQ4IGTKT2ma5lT90JMyiz5QJFeiORhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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