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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd49facf5314a8e9debc05d7d61a3d98175bf717f5ca6bddc5a77657655c86e4' 
  AND token = 'oo4ID+WDMx2i23/ROuyRFy8pAr5WIbEpLBL/My6zkjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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