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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f7524ec332c3f1472af5a59e8fc9d2fb1b1ec874dede86c3cceec57229921d' 
  AND token = 'ggeXI2hJXZ2ss4fQGcBSa42I+2fdbFY/kgNxeLiD9+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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