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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f395325235b34a2cef4e808eeba9eab50d1234c49e10149de0151a24b5dee9c7' 
  AND token = 'BRJ1y7KxVdUwi7avAYAaxpSdxlqsp46OCx0h3JyBaG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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