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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5669eda92b20211cb5b8a83122b6f00d527fa3b6bd66f93f0126f815439b5177' 
  AND token = '9pbyjpwNPF+Lqk686DRnnzih5SJAk/HxF2p9rBMPncY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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