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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9635678c6457d9fad91853a745a0a2e64f613bee5fc341624c8210dd16c0369' 
  AND token = '2TtmBrzMsXuQjWJOJWBE5xBKBi6FxewkFlfl1hkpTPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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