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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093b4cba0fc73bff4e79e58d7c7b1835a94488699065957ef7abd492ae20560d' 
  AND token = 'QJM0PPYmQZwAiYfVTcaseqcIZ5l2Nc4k64tXJuQpmtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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