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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c543fc839c87ea9a510c3e9da43eb30b68c2065570d70d4209796c921e69b87b' 
  AND token = 'S6MOEPDVHz7HMxTqa2NcFsE2aZNR6fLyUKFi0xAkSMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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