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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc64a903481ffb8a302de202a03e98b04a218af1d2c6c5203399af0614a3647' 
  AND token = '+Y+Wx3W9rVYy8PU7Ap8c7YJsxh3RvNhRQ2HWa69CPKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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