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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998fd88fcf806b70f0eddf8a74ed2bfede3a9ad8edaa8f38a6db419a35e04501' 
  AND token = '3P/7jJJE95Y/sCvkc4Up9JbmUZlJ6Q7XV7itd58p5qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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