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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a631d2508ec0a66562ed9b36cc43cd7e0a5c689d0bf326bb209991e8e5ec4d6' 
  AND token = 'oq6N16v3vstFxL9r8G2fFCEcsmStXeQYPXEPA/ta4yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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