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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a2cd562973725b2d71d720d9fd0bd4816f4c98504946679c2f4ef388ae2252' 
  AND token = '2REtWnmU4n7BF6A7PgSlSsVUHtxmGAV9bJExrktCOVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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