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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeba2de19089c61ed5b482c9b41c685aee6ac486c364d0b009c76dbb5d868414' 
  AND token = 't9w+8qECGnTK4Kq1kIc8kUpATknAXuw5xr6el479lF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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