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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1411ae82ebae2a3148f919fc167e5d9b862ccda4fa278ec036a381288eeff1a2' 
  AND token = '1sBEt/MmmyW4hoNLVIo3bycZJckfBujCTFSMoskcVzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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