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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055cf93580d8deaf03b7fae55b66c59f7d27ea7f59154e8f6d2ccd5c20c4677d' 
  AND token = '3ChdnMqug9dWv9WsVo9DN15gn9pNRNk6KSl/AZRIZ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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