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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5dead409b4ed8baace12da59a56b09b1162b1f6991eee06356317ff49e6263' 
  AND token = 'vKxSZyBX9uhI1GkNMp/M7uxKt/tMlmClpw8wTmHMNRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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