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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64a2eb9e0930d55239cc9339b81c7de8d692ca0865c9642c67b91096adcf598' 
  AND token = 'IDJqI1wbUgDNrqKYLb+XuuDAKpaIu0X8Gryj26QbScU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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