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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04dc6a6dab67469c41bd0b323d96f7f6d8e3fbbb4cfbbdcde0be9672f8043a9' 
  AND token = 'wlpz1KdnHloaSn5I71MfQ+X6oGlQZ6GJcsktpRpH53U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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