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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8c64ee36fd84e6fef1782dbd60902b5d14eb38c58ee89c64a9f724a65598c3' 
  AND token = 'Yzcso9MkFuGcjmhSsJStjUY/uoA8XaaNkmbhnich91g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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