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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c137b51f40345b7b2fb83a8c1422acee973cfffa466c649bad2b85e2cc009cf5' 
  AND token = 'Wtge+hRLvJ5DpUkjkM2ecSyxGyWuz+F1H4Wvq7U21AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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