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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71fc24bd6117a25799441eff6a4b00d28d628a91f39108d0ec969184cb28e94' 
  AND token = '/7pFV9TlW7y8GoTHm9rCW5twj8t3Khi2fCVvv9UpMMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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