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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c355915916ea63a1c19bd820f57eb48e78f71ca4f87965870cbbbbb6058ff376' 
  AND token = 'Wo5rla+yqftOTFN57e5C+yoOcH+4uUzn0bKspG/mEio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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