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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f469327ac8ba276868fdfcc9f0e5e38b673f7b9a180675bb3886a93d30124b5' 
  AND token = 'YkRCF19RyF8fBAzFcEfk4ifXia95yxiRC3iLEUsXKCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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