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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3117647dc7bd8e49afe78cddd5e7b7283e058b9f1181bbfa1ced2e0706862d' 
  AND token = '08TMPBVXa+ph1+K/Uap1WQgvDkwrwwnXigW1ZOXXm/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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