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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadfd7df827a1de2af18e07b7be32cedf6e8c9d9a90e90a69c4335c01a65c78d' 
  AND token = 'AY5RZ9od9JEbFBglTc7EOM8SSxCd653ZtUxmIeZVuJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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