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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ef11ca3ad33c149b592627039c484737dc10693ce007018156f63105d839dc' 
  AND token = '1+au+y60VgyBn9ZXW9XcNVXZo787r6DO1DlQ+bsixmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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