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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7562556ce7c1ee761683db3bc5e8122cb689a3fc272f8b63402edc758a1919c9' 
  AND token = 'PBr4xxh0e8XHoAqzhZGkWhhFssI3RHlLtjGXaOx+shM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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