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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d42ffa412caae8a253223bef557a64a9f66f74fb89cc09edf49e73f2190cd3' 
  AND token = 'aqGITOTg5AzDY15XgRzMzYh93H2J9bUstxzgzKecvu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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