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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c741a55d7eeb1b64a50efa016b71b52436d739519353e92f1bf4d4219cd0778' 
  AND token = '0BAyGa0AAc7bvGQeJS0H5km62jeAaORmI41p/J55hkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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