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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9349a3ec3baa585f6683e83ff47418e6c84033aba62ce5730550389c48cc3e5f' 
  AND token = '558FY4OIpcxN0zT+QgM7XxceHOYq1TAJVtMv0rTxoCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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