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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7416c95a8fc4346d0ced2c902981c263e05e13a91068496a1c0dff76a0a1ba13' 
  AND token = '/DOv0E5ZQzU5xYq++nqn3q6Xo1KMHUYUKsEQQKMTvfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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