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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b90d0e77cc58218268ed69da4ec7aeac2a53084030707298922fe92b9b40d4' 
  AND token = 'eg4I2aOpoKFz3eZbt6EKOSeU3/ORppPlskavha9T0Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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