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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59abae3a8b3405e96f1a79dd28e936e2e144052ba16d01c908d434c5671cee20' 
  AND token = '6U8aWk1AWZlREGzPX311wUPBxE4+iAdmV0CBfnXbYls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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