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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3812a7c3d7baedc2ab2152572c2ff1b6d7f551d663d1d954f8ed88832be39edf' 
  AND token = 'S7qLzOahZRvw+fLcEj3MhJ5N9HGcdG0AktcWN2Rs3tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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