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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e712cd3f5a18a7f198f914284226c87b03668c6736b315d62301c0cee1e2dc' 
  AND token = 'yTK43mOHH3Yojz7/nKksOch5VPX6ykEaEgqgjGAS0tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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