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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12de77f0c4521c609e473fbaa92fbaefc2fa006b6174bf74620048600ad288d' 
  AND token = '3cXhK2ZexXKLayB1zUxeZK55sUk9XZaiGWWfgl+zw9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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