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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5bcb7773b4f303ace391e6de00889354646479f9440ec10f4a367627afebc7' 
  AND token = '+bJ8qdn1imRWTih8Hc0nPcxpAS5WpJTwzfTp3E9f8lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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