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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bfdd7d4a489a7246a778696ba4f5d814051cd4695f24fe1c53bd47236b7c38' 
  AND token = 'ZpDWzhHbSzUp6gUJczPVsEx+O95r4NctSbKAN8YIefY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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