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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b8565a1d405705f2d6f07e106c36160b9971c5616f7632d131ca63292db842' 
  AND token = 'dIH/AlKWZ87yqLuWLUYfrX9aUFOGpC09wptVb8Zn17U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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