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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fe4165dd504258b2ac0443997d259b0abd8de48d13faf7e8e1ea8b15fe52a4' 
  AND token = 'LWR/Gwil7pDv8RCkqB1mP8dYe1nVd96f6ElTO3FS0m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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