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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425929744079dd6b9b6a0450f68b44710312d8cf8e64d738ea61bfe3087c87ef' 
  AND token = 'SKcyHSEKM4aVlI43HKtkkEb/Uq7xE3Yt1hLLhibk2Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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