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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a0a1af1909f7ed498386880199702314454d7f1e4a48c763d5172b3d30445b' 
  AND token = 'cyieXzFSp4dvZ2HyY8vYgc0BfC0V4PluJyImTZQFEGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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