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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fc761ef7ce8705bd7c11079f8351cdf057a51f96ea0ccb6320fb20d6721e1c' 
  AND token = 'dQqWbJxwDly8oB1DGUqeXw04kLg/lYMHHip8mbd6wV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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