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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0343ea42dd9526d1b24100c7b1aa6ec995f4a261511c4e0104cfd6a4909654b' 
  AND token = 'J7wsBZfHzj63TgPfMUq+tVKf/7MHZASy4TzOmP97EyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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