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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02820680920fd44b9b3ffa311698f13d93866428a601e2bed79d92df4a28f5ba' 
  AND token = '2cFTVZF4pwVRI0Vn5MeXB/PrQM/odp7cIBzg9N0E+Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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