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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca6935c37dbe6698ed7aade67b979cf1d8592633f94dcc21c37c66da93b0cd7' 
  AND token = 'ybhRzUzUIsO5Xkb9BN7tozeo5GTON2nMjUYvmtTDppo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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