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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24ce42c7b4a0634b255c68f3f4bfbfdc00a7bc81a9a34bc683896337461a662' 
  AND token = 'cSytva4aUVCCQszczcO7UGd6mc3Ja+nSOwZePAsrSnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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