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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eccc92433db2f065bb57b2195b8e9b269a215ef806fa09d76b5d117137a328d' 
  AND token = '4pqarOrN7lz8RNdeasDiL7YzEN4dDG0djKw/wjTW2tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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