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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66519ef8f56bf04c2c3ff9f69818ab5c49ca854cd43e02dc459537ab131f2a1' 
  AND token = 'a5sr8dzJGK+xjbh91LTcDG2Bcv1UIPbEKdKCWBvBCnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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