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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0e33049c4f192d156402c8ff704811470b4a5d50e93778db400d4e79a0f5c5' 
  AND token = '5MWerU/geDCgaPapt5suK/hRRGJJHs7GiSsxxt1mxeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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