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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998d9a3da6021481c0cf51bf6069d6dcfbf25a8072aa99f430013cdca2284c46' 
  AND token = 'r7JCBRoQrRXEoEsXg/k2mZDRKt2OrM8TGqlXKDyWj6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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