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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602f55ae9aefee0a14fee2cd0a819862bd9fd9e810dd1c5420bbc1f9c9421670' 
  AND token = 'SH39HzZQyPXhSz9pU9B0LSn8klKCZbzSXo54KRYp/eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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