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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f4f534fa27474b7f382a5c1e451fad28f64994e250f0e6fc2a3b37a8b78cf3' 
  AND token = '2DzipLUb1FfeSo0VbONAPdsRTavxB0CU8FGevT8fXLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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