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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac767997280417a2fb8e43761d757c8e1b169ea7da431395946ff77cd55fc46f' 
  AND token = 'GCuoneUmihvnTyPOg1lw+pw5N0/KC2YM1AyW3wdNc1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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